Effect of Acid Treatment on the Functionalization of Surface, Structural and Textural Properties of Carbon Nanotubes Taunit
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Eurasian Chemico-Technological Journal
ISSN: 1562-3920
|
| Вых. Данные |
Год: 2019,
Том: 21,
Номер: 4,
Страницы: 291-302
Страниц
: 12
DOI:
10.18321/ectj886
|
| Ключевые слова |
carbon nanotubes, surface oxidation, oxygen-bearing groups, Raman spectroscopy, FTIR spectroscopy |
| Авторы |
Ismagilov Z.R.
1
,
Yashnik S.A.
1
,
Shikina N.V.
1
,
Matus E.V.
1
,
Efimova O.S.
1
,
Popova A.N.
1
,
Nikitin A.P.
1
|
| Организации |
| 1 |
Federal Research Center of Coal and Coal Chemistry, Institute of Coal Chemistry and Material Science SB RAS
|
|
The role of acid treatment of Taunit carbon nanotubes in the formation of oxygencontaining functional groups on its surface as well as morphological and textural properties was studied. Acid treatment was carried out in an HNO3 solution or its mixture with H2SO4 under mild conditions (85 °C/1 h) with subsequent washing with distilled water or without washing. Properties of the initial and oxidized samples were investigated using elemental carbon, hydrogen, nitrogen, oxygen (CHNO) analysis, BET (Brunauer-Emmett-Teller) determination of surface area, X-ray diffraction, Raman and Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy, and hydrogen temperature-programmed reduction. Treatment with HNO3 and HNO3/H2SO4 mixture was shown to be efficient for the formation of
various oxygen-containing groups on the Taunit surface; therewith, the water washing step also contributed to functionalization of the surface. Depending on the oxidant, acid treatment increased graphite and oxygen content in the samples by a factor of 3‒4.5. Treatment with HNO3 without water washing exerted a weak effect on the graphite structure ordering, the concentration of aliphatic groups was high as compared to other oxidation conditions. Treatment of Taunit with the HNO3/H2SO4 mixture, on the contrary, increased the number of defects in graphite
layers and decreased the concentration of aliphatic structures.